THERMAL-EXPANSION AND CHARACTERISTIC FEATURES OF THE STRENGTH OF INTERATOMIC BONDS IN MELTS OF III-V-COMPOUNDS (ALSB, GASB, INSB, GAAS, INAS)

The temperature dependence of the specific volume of melts of III-V co mpounds has been studied thermometrically and with penetrating gamma r adiation. The thermal expansion of these melts has been estimated at v arious temperatures. Based on the similarity of the structure of the m elts and the elastic continuum, the characteristic Debye temperatures and rms dynamic displacements of the atoms in the close-range-order st ructure of these melts have been calculated from the estimated thermal expansion. A considerable change in the indicated characteristics is observed at the transition from the solid state to the liquid state, i ndicating significant changes in the vibrational spectrum of III-V com pounds upon melting. The thermal expansion of the melts is observed to increase upon heating, indicating a further loss of strength of the i nteratomic bonds in the melts with growth of temperature. (C) 1998 Ame rican Institute of Physics.